The requirements of the UK Department of Transport's specification for road and bridgeworks, for aggregates which are to be used in upper courses of flexible roads or as sub-base materials are reviewed. The need for wearing course materials with high resistance to skidding is emphasised, most aggregates with high polished stone value being from the gritstone group. Descriptions are given of the United States Transportation Research Board's five classifications of aggregate for skid resistance, and the relationship between this property and polished stone value is discussed. Reference is made to efforts to produce economically viable synthetic aggregates, and to the improvement of natural aggregates by heat treatment. The Department of Transport's specification for concrete aggregates is included, and a survey is made of the commercial production of aggregates involving the amalgamation of many independent quarries into large groups able to supply in widespread locations a wide selection of crushed rock to meet most specifications. (TRRL)

  • Availability:
  • Corporate Authors:

    Embankment Press Limited

    Building 59, GEC Estate, East Lane
    Wembley, Middlesex HA9 7TQ,   England 
  • Publication Date: 1979-10

Media Info

  • Features: Tables;
  • Pagination: p. 16-19
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00310175
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Oct 8 1980 12:00AM